<style>
    .box {
        width: 100%;
        /* 元素必须给一个尺寸才能显示背景图 */
        height: 500px;
        background-image: url(https://cn.bing.com/th?id=OHR.FanjingStairs_ZH-CN0360402048_UHD.jpg&rf=LaDigue_UHD.jpg&w=300&h=300&c=8&rs=1&o=3&r=0);
        background-repeat: no-repeat;
        background-position: center;
    }
</style>

<div class="box"></div>